1. Team 5 - Propulsion PDR #2 Scott Bird Mike Downes Kelby Haase
Grant Hile
Cyrus Sigari
Sarah Umberger
Jen Watson
November 11, 2003
Propulsion PDR #2

2. Preview Update of Constraint Diagram Choice of new Engine
Redesign of Propeller
Propeller Choice
November 11, 2003
Propulsion PDR #2

3. Which plane are we talking about?
Tail Dragger
Flaperons
Pod
Tractor Engine
November 11, 2003
Propulsion PDR #2

4. Constraining Conditions
Inputs:
CLmax = 1.8
ηp = 0.4
Cdo = 0.03
STO = ft
AR = 7
Vstall = 30 ft/s
Outputs:
W/SHP = 14 lbf/SHP
W/S = 1.8 lbf/ft2
November 11, 2003
Propulsion PDR #2

5. Choice for New Engine Updated HP requirement = 3.6
Previous engine was overpowered
November 11, 2003
Propulsion PDR #2

6. Engine Specifications
OS Max 1.6 FX
Cost: $270
Not Fuel Injected
Gravity fed fuel system
Weight: 2 lb
Uses glow plug
RPM Range 1,800-10,000
3.7 HP at 9,000 RPM
Side exhaust muffler with rotatable exhaust outlet
Comes with illustrated instructions booklet with parts list and OS decal 
November 11, 2003
Propulsion PDR #2

7. Propeller Sizing – Sizing for Take-Off
Used modified gold.m code
Varied Pitch and Propeller Diameter
Max HP at RPM = 9000
Velocity Ranged from 5 ft/s to 55 ft/s
November 11, 2003
Propulsion PDR #2

8. Propeller Sizing – Efficiency vs. Power
Increasing
Diameter
Increasing
Pitch
V = 40ft/s
Propeller Choice: 19x6
November 11, 2003
Propulsion PDR #2

9. Thrust Verification (FBD)
Normal
Drag
Thrust
Our Airplane
Friction
Weight
November 11, 2003
Propulsion PDR #2

10. Efficiency vs Velocity for 19x6 Propeller
ηp = -4e-5V V
Best Fit line for velocities from 5 ft/s to 120 ft/s
November 11, 2003
Propulsion PDR #2

11. Putting EOMs into MATLAB
Put state space EOMs into MATLAB
Used ode45 command to integrate EOMs
Inputs to the code are initial conditions for position and velocity
Used x(0) = 0.1ft and v(0) = 1ft/s to eliminate singularities
Code output position and velocity as a function of time
November 11, 2003
Propulsion PDR #2

12. Output from EOM integration
W/S = 1.8 lbf/ft2
ρ = slug/ft3
CLmaxTO =
0.8*CLmax = 1.44
November 11, 2003
Propulsion PDR #2

13. Output from EOM integration
tTO = 3.7 s
STO = 76 ft
November 11, 2003
Propulsion PDR #2

14. Propeller Sizing – Manufactured Choice
Bolly 19x6
Weight = 0.25 lbf
Price = $53.00
Material: Carbon composites
Comments: A low speed prop for cc engines
November 11, 2003
Propulsion PDR #2

15. Propeller Specifications (from Manufacturer)
Modified Clark-Y Airfoil
Twisted 4o at the root
Reaches maximum twist of 6o at ~70% of the radius
Maximum cord is 1.54 inches
No graphical information exists about lift distribution
November 11, 2003
Propulsion PDR #2

16. Propeller Sizing – Cruise Conditions
Used second modification of gold.m code
Held Pitch constant at 6 inches and Diameter constant at 19 inches
Set velocity = 50 ft/s
Varied RPM
Maximum Efficiency
of 75% occurs at
J = /rev
RPM ~4100
November 11, 2003
Propulsion PDR #2

17. Cruise Conditions J = 0.46 1/rev CP = 0.0092 CT = 0.015
Velocity = 50 ft/s
RPM ~4100
CP =
CT = 0.015
November 11, 2003
Propulsion PDR #2

18. Alternate Cruise Conditions
Vary velocity and RPM to find maximum efficiency
Maximum efficiency occurs at J = /rev
November 11, 2003
Propulsion PDR #2

19. TakeOff Requirements Satisfied! Cruise Conditions:
Summary
New Engine:
OS Max 1.6 FX with 3.7 HP at 9,000 RPM
New Propeller:
Bolly 19x6 carbon composite
TakeOff Requirements Satisfied!
Cruise Conditions:
Velocity = 50 ft/s
RPM ~4100
Efficiency ~75%
November 11, 2003
Propulsion PDR #2

20. Next Steps for the Propulsion Team:
Summary
Next Steps for the Propulsion Team:
Verify takeoff calculations
ITERATE as other values change (yay!)
November 11, 2003
Propulsion PDR #2

21. Questions?
Questions??
November 11, 2003
Propulsion PDR #2

22. EOM file in MATLAB
November 11, 2003
Propulsion PDR #2